Extrusion of a viscous substance through a round hole in an infinite wall

1969 ◽  
Vol 1 (4) ◽  
pp. 140-144
Author(s):  
Kh. Kh. Rakhimov
1996 ◽  
Author(s):  
William W. Taylor ◽  
III
Keyword(s):  

2014 ◽  
Vol 28 (11) ◽  
pp. 1450077
Author(s):  
Werner Scheid ◽  
Aurelian Isar ◽  
Aurel Sandulescu

An open quantum system is studied consisting of a particle moving in a spherical space with an infinite wall. With the theory of Lindblad the system is described by a density matrix which gets affected by operators with diffusive and dissipative properties depending on the linear momentum and density matrix only. It is shown that an infinite number of basis states leads to an infinite energy because of the infinite unsteadiness of the potential energy at the infinite wall. Therefore only a solution with a finite number of basis states can be performed. A slight approximation is introduced into the equation of motion in order that the trace of the density matrix remains constant in time. The equation of motion is solved by the method of searching eigenvalues. As a side-product two sums over the zeros of spherical Bessel functions are found.


2021 ◽  
Author(s):  
Paulo Bala ◽  
Valentina Nisi ◽  
Mara Dionisio ◽  
Nuno Jardim Nunes ◽  
Stuart James

2017 ◽  
Vol 47 ◽  
pp. 7-10
Author(s):  
David L. Sutcliffe ◽  
Robert D.B. Jaquiss
Keyword(s):  

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